Oscar's role in tennis is very much misunderstood and I suspect you do not the truth of what he does or his real contributions. I don't follow Oscar; I follow his results. FYI, I have tried every teaching method on court in 30 years and have worked with every level of player up to satellite tour players. I know players and coaches who have worked with Braden, Bollettieri, and Macci, and then when they stand on the court with OScar, they realize why Oscar is the "man" who tied it all together in one simple teaching system that works for the greatest number of people on earth. Oscar believes that tennis should be taught by feel and not through mechanics, that there are certain biomechanical techniques that allow a person to maximize their athletic potential and that his job is to clean up misconceptions such as "hitting through the target line" which harms many more students than it helps. If you haven't read the History of Tennis on
www.moderntenniscoaches.com, it might help you understand Oscar's real role. If you don't think the Russians aren't dominating tennis because they use Oscar's system, then read the Spartak article on there and the quote from Petrova's coach. Two Russian tennis academies told me through emails they are shocked the USA resists Oscar and one told me they now understand why the USA has trouble developing tennis players. I'm glad coaches resist Oscar, makes me look better on court when I get every single player to hit better and feel better about their game.
Oscar is the one person who has been proven over time to be correct again and again since his Spanish juniors first caught the world's attention in 1973 and today everyone is swinging per the way Oscar teaches. If you don't think the USPTA doing away with conventional teaching was influenced by Oscar hammering away at them, you might want to look at the truth. Russian spends 1/1000th of what the USA spends on junior development. They don't even board their best players and let them play full time as juniors. REad the truth on moderntenniscoaches.com. We keep teaching tennis the same way we have been, we'll continue to get the same results. Serbia didn't even have tennis courts enough so their juniors had to play in bombed out swimming pools and they kick our butts. Enough of my rant.
I like what you said about dynamic grips. YOu are correct, in MTM we hold the racket very loose (Braden and Groppel and other "experts" for years said hold it as tight as possible, I quote them exactly in the History section) because we use the butt and the edge as the source of power. In MTM we teach to lead with the edge and hit below the sweet spot or closer to the trailing edge which explains the Querrey pic below.
At 45, I was a 3.5 player with severe tennis elbow and a washed up tennis coach. At 48, I am hitting 6.0 ground strokes with a pro player and beating 5.0 players regularly. Since I started teaching MTM exclusively per the DVDs and book, I've never had a student not think my lesson was the best they ever had versus any conventional coach, and more than a few of my students paid Braden, Macci, and one even took a $700 an hour lesson from Nick and all said MTM was better. So excuse my loyalty. I would take ten beginners and put them my results on court in two hours up against any coach who did not teach MTM in the entire USA and allow the tennis channel to publish the results. Oscar would do that in a second against any coach in the world, including his own coaches. Tennisone.com didn't declare about Oscar "History Proved Him Right" because their coaches all loved Oscar. They looked at the evidence.
Anyway, the grip adjusts itself depending one what you need to do. What coach would allow a student to not be able to hit low shots? I know that happened when I taught the old ways, but with MTM, we use the left hand to make small changes, even on the backhand volleys with a continental grip, small changes appear oftentimes at the heel of the hand, I used SW and then if I'm on a slow court and hitting high balls, I might move more western. OScar encourages anything but continental and eastern on the FH and allows the racket to move so loosely it's almost scary.
This is usually not seen by the naked eye. I waited five years to find this pic proving what happens on nearly all great shots which I first saw on the famous video of Agassi on the Advanced Tennis Project. I also have Safina doing it also and it happens a lot, even with little kids who play per MTM.
On the 2HBH, you are correct, the "torque" is deadly for topspin. I even teach this to beginners sometimes, how to slam the right hand heel down while pullling up with the left hand index pad and you can do this through the air and hear the "whoosh" difference. Remember to approach the ball slowly with your backswing, cup that right wrist severely if you need to get the racket head lower, and then move across the ball torqueing the edge and you'll hit like a pro. Tennis is much more simple than you realize.